T-Mobile Chases Sprint

By

Miriam Gottfried

Dec. 6, 2012 5:13 p.m. ET

T-Mobile USA is answering Apple's call. And that could create some static for Sprint Nextel.

T-Mobile-parent Deutsche Telekom announced plans Thursday to start selling Apple's iPhone next year in the U.S. and significantly increase its investment in the network. That could impede Softbank Corp.'s goal of creating a stronger No. 3 U.S. wireless carrier.

When Softbank agreed to buy 70% of Sprint in October, the Japanese company's...